body {
    margin: 0;
    padding: 20px;
    background-color: #f0f2f5;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  }
  .dashboard-container {
    max-width: 1800px;
    margin: 0 auto;
  }
  .dashboard-header {
    text-align: center;
    margin-bottom: 20px;
  }
  .dashboard-title {
    font-size: 28px;
    color: #1890ff;
    margin-bottom: 10px;
  }
  .section {
    margin-bottom: 30px;
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.09);
  }
  .section-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e8e8e8;
  }
  .chart-row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -10px;
  }
  .chart-container {
    flex: 1;
    min-width: 300px;
    min-height: 350px;
    margin: 10px;
  }
  .chart {
    width: 100%;
    height: 300px;
  }
  .chart-title {
    text-align: center;
    margin-bottom: 10px;
    font-weight: bold;
  }
  .tooltip {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 4px;
    padding: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  }
  @media (max-width: 768px) {
    .chart-container {
      flex: 100%;
    }
  }